Bluetooth: Add debugfs support to btmrvl driver

/debug/btmrvl/config/
/debug/btmrvl/status/

See Documentation/btmrvl.txt for details.

This patch incorporates a lot of comments given by
Nicolas Pitre <nico@marvell.com>. Many thanks to Nicolas Pitre.
Signed-off-by: Rahul Tank <rahult@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/Kconfig

@@ -173,6 +173,7 @@ config BT_HCIVHCI
 config BT_MRVL
 	tristate "Marvell Bluetooth driver support"
 	select FW_LOADER
+	select DEBUG_FS
 	help
 	  The core driver to support Marvell Bluetooth devices.
 

drivers/bluetooth/Makefile

@@ -15,7 +15,7 @@ obj-$(CONFIG_BT_HCIBTUART)	+= btuart_cs.o
 obj-$(CONFIG_BT_HCIBTUSB)	+= btusb.o
 obj-$(CONFIG_BT_HCIBTSDIO)	+= btsdio.o
 
-btmrvl-objs			:= btmrvl_main.o
+btmrvl-objs			:= btmrvl_main.o btmrvl_debugfs.o
 obj-$(CONFIG_BT_MRVL)		+= btmrvl.o
 obj-$(CONFIG_BT_MRVL_SDIO)	+= btmrvl_sdio.o
 

drivers/bluetooth/btmrvl_drv.h

@@ -79,6 +79,9 @@ struct btmrvl_private {
 				u8 *payload, u16 nb);
 	int (*hw_wakeup_firmware) (struct btmrvl_private *priv);
 	spinlock_t driver_lock;		/* spinlock used by driver */
+#ifdef CONFIG_DEBUG_FS
+	void *debugfs_data;
+#endif
 };
 
 #define MRVL_VENDOR_PKT			0xFE
@@ -135,4 +138,9 @@ int btmrvl_process_event(struct btmrvl_private *priv, struct sk_buff *skb);
 int btmrvl_send_module_cfg_cmd(struct btmrvl_private *priv, int subcmd);
 int btmrvl_prepare_command(struct btmrvl_private *priv);
 
+#ifdef CONFIG_DEBUG_FS
+void btmrvl_debugfs_init(struct hci_dev *hdev);
+void btmrvl_debugfs_remove(struct hci_dev *hdev);
+#endif
+
 #endif /* _BTMRVL_DRV_H_ */

drivers/bluetooth/btmrvl_main.c

@@ -658,6 +658,10 @@ struct btmrvl_private *btmrvl_add_card(void *card)
 		goto err_hci_register_dev;
 	}
 
+#ifdef CONFIG_DEBUG_FS
+	btmrvl_debugfs_init(hdev);
+#endif
+
 	BT_DBG("Leave");
 	return priv;
 
@@ -692,6 +696,10 @@ int btmrvl_remove_card(struct btmrvl_private *priv)
 
 	kthread_stop(priv->main_thread.task);
 
+#ifdef CONFIG_DEBUG_FS
+	btmrvl_debugfs_remove(hdev);
+#endif
+
 	hci_unregister_dev(hdev);
 
 	hci_free_dev(hdev);